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MEV-Boost Builder Market Share
x402
MEV-Boost Builder Market Share is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Aggregates block-builder market share statistics over a recent window of MEV-Boost blocks via the Flashbots relay, returning per-builder block counts, share percentages, and ETH paid to proposers.
Price / call$0.002
Success—
StatusUnknown
How this service works
Builder market share aggregated over the last N MEV-Boost blocks via the Flashbots relay. Returns per-builder block count, share percent, total ETH paid to proposers, and average per block. Use to track block-builder concentration or detect a new builder gaining share.
Output
A list of block builders with their individual block counts, market share percentage, total ETH paid to proposers, and average ETH paid per block — computed over the requested window of recent MEV-Boost blocks from the Flashbots relay.
Example use cases
Example prompt
“Show me the block-builder market share and ETH paid to proposers aggregated over the last 50 MEV-Boost blocks via the Flashbots relay, so I can see if any builder is dominating or a new one is gaining ground.”
Technical details
Endpoint
POSThttps://agent402.tools/api/mev-builder-shareWhen to prefer
Use this endpoint when you need a quick, aggregated snapshot of Ethereum block-builder concentration from the Flashbots relay without having to query raw relay data yourself. Ideal for monitoring builder centralization trends, detecting new entrants, or computing proposer revenue statistics over a sliding window of recent blocks.
Side effects
- window parameter out of range (must be 10-200) returns a validation error
- Flashbots relay data temporarily unavailable causes a service error
- payment failure or insufficient USDC balance prevents the call from completing
- malformed request body returns a 400 bad request
- window set too small may return noisy or unrepresentative share data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| window | number | Recent blocks to aggregate (10-200, default 100). |
Output
Schema · Response
{
"type": "json",
"example": {
"relay": "flashbots",
"builders": [
{
"blocks": 42,
"sharePct": 42,
"builderShort": "0x90000000…abcdef",
"builderPubkey": "0x9000...",
"avgEthPerBlock": 0.082305,
"totalEthToProposers": 3.456789
}
],
"windowBlocks": 100,
"uniqueBuilders": 5
}
}Tags
x402
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